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Naomi GD-ROM Bios

  1. Game infos
  2. Sound
  3. Driver
  4. Inputs
  5. Controls
  6. Display
  7. Configurations
  8. Dipswitchs
  9. Roms list
  10. BIOS set
  11. Chips list
  12. Categories
  13. MAMEinfo
  14. History
Download naomigd.zip (18 MB)
Snapshot

Game infos

Description Naomi GD-ROM Bios
Name naomigd
Manufacturer Sega
Year 2001
Runnable yes
System arcade /
Number of players BIOS
Added to MAME .126
Romset size 18 MB
Romset file 11 files
Romset zip 3 B
Genre System

Sound infos

Sound_channels 2

Driver infos

Driver status preliminary
Driver emulation preliminary
Driver color good
Driver sound imperfect
Driver graphic imperfect
Driver cocktail
Driver protection
Driver savestate yes

Inputs infos

Input service yes
Input tilt yes
Input players 2
Input buttons
Input coins 2

Controls infos

type ways minimum maximum sensitivity keydelta reverse
joy 8 no

Display infos

type rotate flipx width height refresh pixclock htotal hbend hbstart vtotal vbend vbstart
raster 0 no 640 480 61.702586 26917136 820 0 640 532 0 480

Configuration

name tag mask
Bilinear Filtering
Name No
Value 0
Default yes
Name Yes
Value 1
Default no

MAMEDEBUG
 1
Disable Render Calls
Name No
Value 0
Default yes
Name Yes
Value 2
Default no

MAMEDEBUG
 2
Master CPU Clock Rate (Cheat)
Name 100%
Value 0
Default yes
Name 12.5%
Value 12
Default no
Name 25%
Value 8
Default no
Name 50%
Value 4
Default no

MAMEDEBUG
 12

Dipswitchs

Roms list

console name bios size crc md5 merge sha1 region offset status optional
arcade epr-21576e.ic27 bios0 2097152 08c0add7 e7c1a7673cb2ccb21748ef44105e46d1bad7266d maincpu 0 good no
arcade epr-21576g.ic27 bios1 2097152 d2a1c6bf 6d27d71aec4dfba98f66316ae74a1426d567698a maincpu 0 good no
arcade epr-21576h.ic27 bios2 2097152 d4895685 91424d481ff99a8d3f4c45cea6d3f0eada049a6d maincpu 0 good no
arcade epr-21577e.ic27 bios8 2097152 cf36e97b b085305982e7572e58b03a9d35f17ae319c3bbc6 maincpu 0 good no
arcade epr-21577g.ic27 bios7 2097152 25f64af7 99f9e6cc0642319bd2da492611220540add573e8 maincpu 0 good no
arcade epr-21577h.ic27 bios6 2097152 fdf17452 5f3e4b677f0046ce690a4f096b0481e5dd8bb6e6 maincpu 0 good no
arcade epr-21578e.ic27 bios5 2097152 087f09a3 0418eb2cf9766f0b1b874a4e92528779e22c0a4a maincpu 0 good no
arcade epr-21578g.ic27 bios4 2097152 55413214 bd2748365a9fc1821c9369aa7155d7c41c4df43e maincpu 0 good no
arcade epr-21578h.ic27 bios3 2097152 7b452946 8e9f153bbada24b37066dc45b64a7bf0d4f26a9b maincpu 0 good no
arcade main_eeprom.bin 128 fea29cbb 4099f1747aafa07db34f6e072cd9bfaa83bae10e main_eeprom 0 good no
arcade x76f100_eeprom.bin 132 3ea24b6a 3a730ebcf56e0060fef6b1b02eb2eb7cfb7e61dc naomibd_eeprom 0 good no

BIOS set

name description default
bios0 epr-21576e (Japan) yes
bios1 epr-21576g (Japan) yes
bios2 epr-21576h (Japan) yes
bios3 epr-21578h (Export) yes
bios4 epr-21578g (Export) yes
bios5 epr-21578e (Export) yes
bios6 epr-21577h (USA) yes
bios7 epr-21577g (USA) yes
bios8 epr-21577e (USA) yes

Chips list

name tag type clock
AICA aica audio
ARM7 soundcpu cpu 2822400
M68000 comm_board:m3commcpu cpu 10000000
SH-4 (little) maincpu cpu 200000000
Speaker rspeaker audio
Z80 mie_maple:mie cpu 13500000

Categories

MAMEinfo

NAOMI GD-ROM BIOS (Sega 2001)


BIOS:

epr-21576e.ic27 (maincpu $0 - 2MB) Japan

epr-21576g.ic27 (maincpu $0 - 2MB) Japan

epr-21576h.ic27 (maincpu $0 - 2MB) Japan

epr-21578h.ic27 (maincpu $0 - 2MB) Export

epr-21578g.ic27 (maincpu $0 - 2MB) Export

epr-21578e.ic27 (maincpu $0 - 2MB) Export

epr-21577h.ic27 (maincpu $0 - 2MB) USA

epr-21577g.ic27 (maincpu $0 - 2MB) USA

epr-21577e.ic27 (maincpu $0 - 2MB) USA

315-6334.ic11 (user2 $0 - 128k)

fpr-23489c.ic14 (user2 $0 - 2MB)

203_203.bin (user2 $0 - 2MB)

fpr23718.ic36 (user2 $0 - 2MB)

213_203.bin (user2 $0 - 2MB)

217_203.bin (user2 $0 - 2MB)

fpr23905.ic36 (user2 $0 - 2MB)

317_312.bin (user2 $0 - 2MB)

401_203.bin (user2 $0 - 2MB)

main_eeprom.bin (main_eeprom $0 - 128)

x76f100_eeprom.bin (naomibd_eeprom $0 - 132)


WIP:

- 0.180: Added unknown security PICs 253-5508-0352E [mohamad "The Hedgehog" issawi, colour.thief], 253-5508-0456J [ANY] and 253-5508-0506J [Android].

- 0.177: Added all known Sega DIMM board firmware dumps [TylerDurden67].

- 0.176: Added Net-DIMM 3.03 firmware (fpr23905.ic36) [letoram, gamerfan, Mark F., Smitdogg, The Dumping Union].

- 0.175: Added Net-DIMM firmware (fpr23718.ic14) and notes [MetalliC].

- 0.161: BIOS info corrections [MetalliC]. Removed BIOS epr-21576d (Japan), epr-21578d (Export), epr-21577d (USA) and epr-21579d (Korea).

- 0.145u8: Added Rev "H" USA NAOMI BIOS [Brian Troha, The Dumping Union].

- 0.143u5: Added rev "D" Korea BIOS [gamerfan, Smitdogg, Brian Troha, The Dumping Union].

- 0.143u3: Removed 315-6146.bin rom.

- 0.142u3: Added Z80 (4MHz) CPU3 and 315-6146.bin rom.

- 0.141u3: Added eeprom-naomi-x76f100-default.bin BIOS rom.

- 0.136: Added eeprom-naomi-main-default.bin BIOS rom.

- 0.135u4: Added BIOS 4/5 roms epr-21578h.ic27 and epr-21578g.ic27 (Export).

- 0.126: Guru added 'NAOMI GD-ROM BIOS' (Sega 2001).

History


Arcade System published 19 years ago:

NAOMI GD-ROM System (c) 2000 Sega Enterprises, Limited.

- TECHNICAL -

The GD-ROM upgrade is compatible with Naomi and Naomi 2 via the option port on the top of the board. It comes with a DIMM board, very similar to the ROM board on a normal NAOMI cartridge, but has RAM instead of ROMS.

RAM board Uses normal PC type DIMM's, so upgrading memory is not a problem, and relativly cheap.

The GD Rom system has a very clever way of getting around the loading delay time. When the game is initially installed, the GD ROM loads its content into the Naomi RAM. Once this is completed, the GD ROM goes into standby unless the RAM gets corupted or the game gets shut off for 72 hours or more. This does two things,

1) Eliminates loading delays completely, (after initial power up.)
2) Minimizes the on/off cycles of the GD ROM drive and greatly increasing the life of this mechanical device.

From Sega R+D - "We learned a lesson watching our coin-op competitors go through hardware hell. Many have been using off-board storage devices for years - hard drives, CD's, etc. with great success in increased content but at a tremendous cost in realiablity. These storage devices simply could not withstand the constant on/off cycling a coin-op application demands. Add to that the dirt and smoke a game has to put up with on location vs. a normal computer application and you can see how this was a problem waiting to happen"

The GD-Rom system uses an electronic "key" that plugs into the DIMM module to act as an activator, to prevent people just copying the GD-Roms, visible on the top right of the pictures. A different key is supplied with every game.

There is a well founded rumor that Sega may use this system for having multigame cabinets like the neogeo multi systems, as the GR-Rom can store a LOT of data....

- CONTRIBUTE -

Edit this entry: https://www.arcade-history.com/?&page=detail&id=48276&o=2